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A follow up- the G15 just ran 25 miles without hiccup, using only the left petcock. So- between the lightened needles and ditching the fuel filters, all seems well once more. Most of the running was at lower speeds and throttle settings and it wasn’t fouling plugs, so it would appear my original assessment of the float heights being too high was correct.I think the aluminum needles are needed and the brass units are to be avoided- hardly controversial advice here, which I would have known if I had looked a bit deeper. I’m new to Amal Concentrics and had not even considered that the needles are upside down compared to most, and need to be lifted up to allow the bowl to fill. On a Bing/Mikuini/Delorto/Keihin the needle falls down to open the fuel flow, so a small bit of fuel restriction upstream won’t matter. I considered popping the plastic units back in but wanted the Viton sealing tips- and would have ordered up a set of aluminum needles if I hadn’t had a mill sitting over in the corner of the shop.
A follow up- the G15 just ran 25 miles without hiccup, using only the left petcock. So- between the lightened needles and ditching the fuel filters, all seems well once more. Most of the running was at lower speeds and throttle settings and it wasn’t fouling plugs, so it would appear my original assessment of the float heights being too high was correct.
I think the aluminum needles are needed and the brass units are to be avoided- hardly controversial advice here, which I would have known if I had looked a bit deeper. I’m new to Amal Concentrics and had not even considered that the needles are upside down compared to most, and need to be lifted up to allow the bowl to fill. On a Bing/Mikuini/Delorto/Keihin the needle falls down to open the fuel flow, so a small bit of fuel restriction upstream won’t matter. I considered popping the plastic units back in but wanted the Viton sealing tips- and would have ordered up a set of aluminum needles if I hadn’t had a mill sitting over in the corner of the shop.
